A ship leaves port with drafts $7\mathrm{.}6$ m F and $7\mathrm{.}9$ m A$.400$ tonnes of bunkers are burned from a space whose centre of gravity is $15$ m forward of the centre of flotation, which is amidships. TPC $20$ tonnes. MCT $1$ cm $300$ tonnes m$.$ Find the minimum amount of water which must be run into the forepeak tank $($centre of gravity $60$ m forward of the centre of flotation$)$ inorder to bring the draft aft to the maximum of $7\mathrm{.}7$ m$.$ Find also the final draft forward.